Tree ring celluloseδ18O ofFokienia hodginsiiin northern Laos: A promising proxy to reconstruct ENSO?

Xu, Chenxi; Sano, Masaki; Nakatsuka, Takeshi

doi:10.1029/2011jd016694

Cited by 90 publications

(101 citation statements)

References 59 publications

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“…Notably, the driest year over the last century, the El Niño-Southern Oscillation (ENSO) related drought of 1925-1926 (30), also shows the highest excursion in the entire δ 18 O tr record. The finding that δ 18 O tr is primarily related to interannual changes in wet season precipitation, agrees also with findings in tree rings from Costa Rican cloud forests (31) and northern Laos (32). The observed influence of precipitation on the oxygen signal is in line with climate-model results (9,14), and with observations on the relationship between δ 18 O prec and (amount of) precipitation in the Amazon (10,14).…”

Section: Resultssupporting

confidence: 79%

“…These results and observations of ENSO signals in Andean ice core records (16) indicate that it is the large-scale atmospheric circulation that controls Nino3.4 SST anomalies (14). Similar controls of ENSO on the isotopic signature in tree rings were observed in Costa Rica (40) and Asia (32,41), and negative correlations were observed along the west coast of Peru, where warm-phase ENSO events result in increased precipitation and thus negative excursions in δ 18 O (23). These tree-ring isotope studies show that ENSO affects interannual variation in plant δ 18 O over large areas in the tropics.…”

Section: Large-scale Drivers Of Interannual To Decadal Variation In Tsupporting

confidence: 58%

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Oxygen isotopes in tree rings are a good proxy for Amazon precipitation and El Niño-Southern Oscillation variability

Brienen

Helle

Pons

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

171

145

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We present a unique proxy for the reconstruction of variation in precipitation over the Amazon: oxygen isotope ratios in annual rings in tropical cedar (Cedrela odorata). A century-long record from northern Bolivia shows that tree rings preserve the signal of oxygen isotopes in precipitation during the wet season, with weaker influences of temperature and vapor pressure. Tree ring δ 18 O correlates strongly with δ 18 O in precipitation from distant stations in the center and west of the basin, and with Andean ice core δ 18 O showing that the signal is coherent over large areas. The signal correlates most strongly with basin-wide precipitation and Amazon river discharge. We attribute the strength of this (negative) correlation mainly to the cumulative rainout processes of oxygen isotopes (Rayleigh distillation) in air parcels during westward transport across the basin. We further find a clear signature of the El Niño-Southern Oscillation (ENSO) in the record, with strong ENSO influences over recent decades, but weaker influence from 1925 to 1975 indicating decadal scale variation in the controls on the hydrological cycle. The record exhibits a significant increase in δ 18 O over the 20th century consistent with increases in Andean δ 18 O ice core and lake records, which we tentatively attribute to increased water vapor transport into the basin. Taking these data together, our record reveals a fresh path to diagnose and improve our understanding of variation and trends of the hydrological cycle of the world's largest river catchment.climate change | dendrochronology | plant physiology T he Amazon basin is a major center of atmospheric convection and precipitation (1), and at the same time the world's largest drainage basin. The Amazon's river discharge accounts for ∼17% of the annual global discharge to the oceans (2); its hydrological cycle is tightly linked with the carbon cycle of the Amazon rainforest (3), which itself is one of the largest terrestrial biomass carbon pools. Changes in the hydrological cycle of the Amazon may therefore significantly affect atmospheric dynamics and global climate by changing atmospheric CO 2 concentration. Two particularly severe droughts occurred within the last decade (4), and long-term river records of the Amazon show a steady increase in discharge over the last century (5), indicating that the system may start to undergo some changes. It has been suggested that these changes are a result of anthropogenic warming, but they may also be part of longer-term, natural climatic variability. To clarify such a globally important issue, long-term, accurate records of the hydrological cycle of the Amazon basin are needed. However, meteorological data are only reliable for the last 50-60 y (6), and annually resolved long-term proxies for the hydrological cycle from within the Amazon basin itself are very scarce (7).A commonly used diagnostic for strength and functioning of the water cycle is the isotopic composition of precipitation. Although variation of oxygen isotope ratios in precip...

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Section: Resultssupporting

confidence: 79%

Section: Large-scale Drivers Of Interannual To Decadal Variation In Tsupporting

confidence: 58%

Oxygen isotopes in tree rings are a good proxy for Amazon precipitation and El Niño-Southern Oscillation variability

Brienen

Helle

Pons

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

171

145

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“… 18 O studies on teak from India (Managave et al, 2010a;Managave et al, 2011) found both negative and positive correlations with the amount of rainy season rainfall at inter-and intra-annual scale. Studies in tropical regions of South-America have likewise reported negative correlation with the rainfall amount during rainy season (Ballantyne et al, 2010;Brienen et al, 2012), as have isotope studies in Southeast Asia (Sano et al, 2012;Xu et al, 2011;Zhu et al, 2012). However, none reported correlations with dry and rainy season rainfall as revealed here for Indonesian teak.…”

mentioning

confidence: 38%

Multiple tree-ring chronologies (ring width, δ13C and δ18O) reveal dry and rainy season signals of rainfall in Indonesia

Schollaen

Heinrich

Neuwirth

et al. 2013

Quaternary Science Reviews

104

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Climatic hazards, such as severe droughts and floods, affect extensive areas across monsoon Asia and can have profound impacts on the populations of that region. The area surrounding Indonesia, including large portions of the eastern Indian Ocean and Java Sea, plays a key role in the global climate system because of the enormous heat and moisture exchange that occurs between the ocean and atmosphere there. Here, we evaluate the influence of rainfall variability on multiple treering parameters of teak (Tectona grandis) trees growing in a lowland rain forest in Central Java (Indonesia). We assess the potential of, annually resolved, tree-ring width, stable carbon ( 13 C) and oxygen ( 18 O) isotope records to improve our understanding of the Asian monsoon variability.Climate response analysis with regional, monthly rainfall data reveals that all three tree-ring parameters are significantly correlated to rainfall, albeit during different monsoon seasons. Precipitation in the beginning of the rainy season (Sep-Nov) is important for tree-ring width, confirming previous studies. Compared to ring width, the stable isotope records possess a higher degree of common signal, especially during portions of the peak rainy season (

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“…Although using whole wood (bulk wood) for isotopic analyses is reportedly acceptable, uncertainties regarding the analysis of whole wood remain (Loader et al 2003;Ferrio and Voltas 2005;Verheyden et al 2005b), especially for analysis at intra-annual scales. In addition, a recent advance has allowed the extraction of α-cellulose directly from cross-sectional laths before the subdivision of tree rings (Li et al 2011;Xu et al 2011;Kagawa et al 2015). Therefore, we used α-cellulose for isotope analysis and applied the cross-section method proposed by Kagawa et al (2015) for the extraction.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Therefore, we used α-cellulose for isotope analysis and applied the cross-section method proposed by Kagawa et al (2015) for the extraction. The chemical protocol was based on the Jayme and Wise method (Green 1963) modified for α-cellulose extraction (Mullane et al 1988;Loader et al 1997;Xu et al 2011).…”

Section: Sample Preparationmentioning

confidence: 99%

Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra firme forest

et al. 2015

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in Manaus. However, the δ 18 O wc patterns of E. coriacea differed by region. The ages of some samples estimated from the δ 18O wc cycles were offset from the ages estimated by 14 C dating. In the case of E. coriacea, this phenomenon suggested that missing or wedging rings may occur frequently even in well-grown individuals. Successful cross-dating may be facilitated by establishing δ 18 O wc master chronologies at both seasonal and inter-annual scales for tree species with distinct annual rings in each region.

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Tree ring celluloseδ¹⁸O ofFokienia hodginsiiin northern Laos: A promising proxy to reconstruct ENSO?

Cited by 90 publications

References 59 publications

Oxygen isotopes in tree rings are a good proxy for Amazon precipitation and El Niño-Southern Oscillation variability

Oxygen isotopes in tree rings are a good proxy for Amazon precipitation and El Niño-Southern Oscillation variability

Multiple tree-ring chronologies (ring width, δ13C and δ18O) reveal dry and rainy season signals of rainfall in Indonesia

Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra firme forest

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